Re: [Xen-devel] [PATCH] xen: start PCI hole at 0xe0000000 (same as pc_init1 and qemu-xen-traditional)

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Thu, 30 May 2013, Andreas FÃrber wrote:
> Am 30.05.2013 15:20, schrieb Stefano Stabellini:
> > We are currently setting the PCI hole to start at HVM_BELOW_4G_RAM_END,
> > that is 0xf0000000.
> > Start the PCI hole at 0xe0000000 instead, that is the same value used by
> > pc_init1 and qemu-xen-traditional.
> > 
> > This fixes a bug with device assignment of graphic cards with large
> > amount of video memory (http://marc.info/?l=xen-devel&m=136242365010750).
> > 
> > Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
> > CC: qemu-stable@xxxxxxxxxx
> > CC: pbonzini@xxxxxxxxxx
> > CC: afaerber@xxxxxxx
> > CC: hanweidong@xxxxxxxxxx
> > CC: arei.gonglei@xxxxxxxxxx
> > ---
> >  hw/i386/pc_piix.c    |    6 +++---
> >  include/hw/i386/pc.h |    3 +++
> >  xen-all.c            |   12 ++++++------
> >  3 files changed, 12 insertions(+), 9 deletions(-)
> > 
> > diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
> > index 43ab480..06416ce 100644
> > --- a/hw/i386/pc_piix.c
> > +++ b/hw/i386/pc_piix.c
> > @@ -102,9 +102,9 @@ static void pc_init1(MemoryRegion *system_memory,
> >          kvmclock_create();
> >      }
> >  
> > -    if (ram_size >= 0xe0000000 ) {
> > -        above_4g_mem_size = ram_size - 0xe0000000;
> > -        below_4g_mem_size = 0xe0000000;
> > +    if (ram_size >= QEMU_BELOW_4G_RAM_END ) {
> > +        above_4g_mem_size = ram_size - QEMU_BELOW_4G_RAM_END;
> > +        below_4g_mem_size = QEMU_BELOW_4G_RAM_END;
> >      } else {
> >          above_4g_mem_size = 0;
> >          below_4g_mem_size = ram_size;
> > diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
> > index 663426c..626442b 100644
> > --- a/include/hw/i386/pc.h
> > +++ b/include/hw/i386/pc.h
> > @@ -77,6 +77,9 @@ extern int fd_bootchk;
> >  void pc_register_ferr_irq(qemu_irq irq);
> >  void pc_acpi_smi_interrupt(void *opaque, int irq, int level);
> >  
> > +#define QEMU_BELOW_4G_RAM_END       0xe0000000
> > +#define QEMU_BELOW_4G_MMIO_LENGTH   ((1ULL << 32) - QEMU_BELOW_4G_RAM_END)
> > +
> >  void pc_cpus_init(const char *cpu_model, DeviceState *icc_bridge);
> >  void pc_hot_add_cpu(const int64_t id, Error **errp);
> >  void pc_acpi_init(const char *default_dsdt);
> > diff --git a/xen-all.c b/xen-all.c
> > index 539a154..5ca0c26 100644
> > --- a/xen-all.c
> > +++ b/xen-all.c
> > @@ -161,18 +161,18 @@ static void xen_ram_init(ram_addr_t ram_size)
> >      ram_addr_t block_len;
> >  
> >      block_len = ram_size;
> > -    if (ram_size >= HVM_BELOW_4G_RAM_END) {
> > +    if (ram_size >= QEMU_BELOW_4G_RAM_END) {
> 
> Is the HVM_ constant still used elsewhere? I don't see it being removed.
> 
> Otherwise looks straightforward.

It's defined in the Xen headers so we don't have to remove it here.

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